Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 14,339	$ 17,511
Weighted average common shares outstanding	72,676,000	73,260,000
Dilutive effect of stock-based awards	493,000	522,000
Shares used in computing diluted earnings per share	73,169,000	73,782,000
Basic earnings per share	$ 0.20	$ 0.24
Diluted earnings per share	$ 0.20	$ 0.24
Number of antidilutive options that were excluded from computation of earnings per share	0	0